Boiler and operating method of same

摘要

A boiler operating method operates a boiler by switching between air combustion mode and oxygen combustion mode when burning fossil fuel with first combustion gas and second combustion gas. The second combustion gas compensates for oxygen deficiency in the first combustion gas. The air combustion mode uses air as the first combustion gas and the second combustion gas while the oxygen combustion mode uses mixed gas of combustion flue gas and oxygen-rich gas as the first combustion gas and the second combustion gas, the combustion flue gas being produced when the fossil fuel is burned. By mixing the oxygen-rich gas in the air in the process of switching between air combustion mode and oxygen combustion mode, the air being the first combustion gas used in the air combustion mode, the boiler operating method can switch between the air combustion mode and oxygen combustion mode while maintaining stable combustion.

主权项

1. A boiler operating method comprising:
burning a fossil fuel with a first combustion gas used to transport the fossil fuel and a second combustion gas used to compensate for oxygen deficiency of the first combustion gas; switching operations between air combustion mode in which air is used as the first and the second combustion gas, and oxygen combustion mode in which mixed gas of combustion flue gas of the fossil fuel and oxygen-rich gas is used as the first and the second combustion gas; in the process of switching from the air combustion mode to the oxygen combustion mode, mixing the oxygen-rich gas in the air used as the first combustion gas in the air combustion mode; and switching the air to the mixed gas of the combustion flue gas and the oxygen-rich gas, wherein in the process of switching from the air combustion mode to the oxygen combustion mode, the oxygen-rich gas is mixed in the air used as the first combustion gas, and then the oxygen-rich gas is mixed in the second combustion gas.